<template>
    <div class="login_container">
    <div class="login_box">
        <!--头像区域-->
        <div class="avatar_box">
            <img src="../assets/logo.png" alt="">
        </div>
        <!--登录表单区域-->
        <el-form ref="loginFormRef" :rules="loginFormRules" :model="loginForm" label-width="0px" class="login_form">
            <!--用户名-->
            <el-form-item prop="username">
                <el-input v-model="loginForm.username"  prefix-icon="iconfont icon-user"></el-input>
            </el-form-item>
            <!--密码-->
            <el-form-item prop="password">
                <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
            </el-form-item>
            <!--按钮区域-->
            <el-form-item class="btns">
                <el-button type="primary" @click='login' >登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
        </el-form>
    </div>
    </div>
</template>

<script>
export default {
    data() {
        return  {
            //这是登录表单的数据绑定对象
            loginForm:{
                username:'admin',
                password:'123456'
            },
            //表单的验证规则对象
            loginFormRules: {
                //验证用户名是否合法
                username:[
                    { required: true, message: '请输入登录名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                //验证密码是否合法
                password:[
                    { required: true, message: '请输入登录密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
            } 
        };   
    },
    methods:{
        //点击重置按钮，重置表单
        resetLoginForm() {
            //console.log(this);
            this.$refs.loginFormRef.resetFields();
        },
        login() {
            this.$refs.loginFormRef.validate(async valid => {
                if (!valid) return;
                const {data: res} = await this.$http.post("login", this.loginForm);
                if(res.meta.status !== 200) return this.$message.error("登录失败");
                this.$message.success("登录成功")
                //1、将登录成功之后的token，保存到客户端的sessionStore中
                //  1.1项目中出了登录之外的其他API接口，必须在登录之后的才能访问
                //  1.2token只应在当前网站打开期间生效，所以将token保存在sessionStore中
                window.sessionStorage.setItem('token', res.data.token)
                //2、通过编程式导航跳转到后台主页，路由地址是 /home
                this.$router.push('/home')
            });
        }
    }
};
</script>>

<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
}

.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);

    .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }

    .login_form{
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
    .btns{
        display: flex;
        justify-content: right;
    }
}
</style>>